<div class="card">
  <table width="100%">
    <thead>
    <tr>
      <td colspan="2">{{kl.title}}</td>
    </tr>
    <tr>
      <td>知识点</td>
      <td>掌握程度</td>
    </tr>
    </thead>
    <tbody>
    <tr *ngFor="let sm of kl.summaries">
      <td>{{sm.content}}</td>
      <td><span class="level{{sm.level}}"></span></td>
    </tr>
    </tbody>
  </table>
</div>

